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1 AOAC SMPR Standard Method Performance Requirements (SMPRs ) for Screening and Identification Method for Regulated Veterinary Drug Residues in Food Intended Use: Routine Surveillance for GMP Compliance 1 Purpose AOAC SMPRs describe the minimum recommended performance characteristics to be used during the evaluation of a method. The evaluation may be an on-site verification, a singlelaboratory validation, or a multi-site collaborative study. SMPRs are written and adopted by AOAC stakeholder panels composed of representatives from the industry, regulatory organizations, contract laboratories, test kit manufacturers, and academic institutions. AOAC SMPRs are used by AOAC expert review panels in their evaluation of validation study data for method being considered for Performance Tested Methods SM or AOAC Official Methods of Analysis SM, and can be used as acceptance criteria for verification at user laboratories. 2 Applicability A method or a suite of methods that can screen for and identify regulated veterinary drug residues with established maximum residue limits (MRLs) in bovine,, and fat; chicken, skin with adhering fat, and eggs; and fish. Table 1 is provided as guidance on veterinary drug residue/matrix combinations and associated MRLs. Additional matrices may be added as appendices to this SMPR in the future. A single method is not required to cover all drug/matrix combinations, but method developers should strive to include as many relevant drug residues as possible for each matrix claimed. Method developers may choose to claim one or more matrices. 3 Analytical Technique Liquid chromatography-tandem mass spectrometry (LC-MS/ MS), using low- or high-resolution MS. 4 Definitions Maximum residue limit (MRL). The maximum allowable concentration of a drug residue in a particular matrix. Also known as tolerance in the United States. MRL varies by matrix and by country or regulatory agency. For the purposes of this SMPR, the lowest MRL currently in effect amongst European Union (EU), Codex, Canada, China, and U.S. regulations will be used as the MRL. In cases in which an MRL applies to the sum of metabolites or sum of drugs, that MRL was chosen over MRLs for a single metabolite or marker residue. If no MRL is provided in Table 1 (shaded cells), then the drug is either prohibited in that matrix by one or more regulatory agencies or an MRL is not required. Probability of detection (POD). Proportion of positive analytical outcomes for a qualitative method for a given matrix at a given analyte level or concentration. [Appendix H: Probability of Detection (POD) as a Statistical Model for the Validation of Qualitative Methods, Official Methods of Analysis of AOAC INTERNATIONAL (2019) 21st Ed., AOAC INTERNATIONAL, Rockville, MD, USA ( 5 Method Performance Requirements See Table 2. 6 System Suitability Tests and/or Analytical Quality Control Suitable methods will include blank check samples and check standards at 0.5x MRL prepared in matrix. Method developers will provide information on how cutoffs are determined. 7 Reference Material(s) Refer to Annex F: Development and Use of In-House Reference Materials in Appendix F: Guidelines for Standard Method Performance Requirements, 21st Ed. of the Official Methods of Analysis of AOAC INTERNATIONAL (2019). Available at Validation Guidance Appendix D: Guidelines for Collaborative Study Procedures to Validate Characteristics of a Method of Analysis, 21st Ed. of the Official Methods of Analysis of AOAC INTERNATIONAL (2019). Available at Appendix F: Guidelines for Standard Method Performance Requirements, 21st Ed. of the Official Methods of Analysis of AOAC INTERNATIONAL (2019). Available at aoac.org/app_f.pdf Method developers may prepare cocktails of multiple drug residues. Method developers are cautioned that some drug residues may have additive or masking effects when combined and should be prepared to demonstrate that these concerns have been addressed with their submitted materials/data. Method developers should consider the stability of drug residues in cocktails and be prepared to demonstrate that these concerns have been addressed in their data submission package. Performance criteria in Table 2 are for single-laboratory validation. Method developers should contact AOAC for developing a collaborative study design. Method developers must provide the precursor ion and at least two standard reference material (SRM) transitions with ion ratios and retention parameters for each veterinary drug. 9 Maximum Time-to-Result None Approved by the AOAC Stakeholder Panel on Strategic Food Analytical Methods (SPSFAM). Final Version Date: August 26, 2018.